Building tbuss



A; E. SHODIN BUILDING TRUSS June 25, 1929.

Filed Aug. 22, 1927 5 INVEIyTOR. 7527? ZZZ 5% oafzrz ATTORNEY" PatentedJune 25, 1929.

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BUILDING TRUSS.

Application filed August 22, 1927. Serial No. 214,669.

This invention relates to building roof trusses.

It is an object of mypresent invention to provide an improved, metalskeleton truss including a reinforced, concrete beam body.

Another object is to provide a roof system combining a double componentspringer arch and a straight tension chord, and in this connection anobject is to provide arch and chord members of stock angleiron or L-barwhereby to obtain simplicity, strength and low cost of material, andeffect a fireproof structure.

Other objects, advantages and features of construction, combination andarrangementand details of elements will be made manifest in thefollowing specification of the herewith illustrated embodiment; it beingun derstood that modifications, variations and adaptations may beresorted to within the spirit, scope and principle of the invention asit is more directly claimed hereinafter.

Flgure 1 is an elevation of one portion of the truss.

Figure 2 is a plan of an end of the truss.

line 3-3 of Figure 7 is an elevation of amountedtruss showing the Wallscarried above the ends of the truss.

The present truss consists of an upper springer or arch including evenlyspaced con centric or parallel stock angle-iron bars in pairs, and abase chord formed of a pair of angle-iron bars whose ends merge into theends of the springer or arch.

Sufficient of the truss is here shown to indicate the fabrication of thewhole. While the top of the truss is represented as springing instraight lines it is to be understood that the same construction may bein arch or curved form.

The chord consists of a pair of a set of straight angle-bars 2-3 withupturned Webs 4 spaced to receive and being riveted on upper diagonalbraces 5 and tandem end plates 6-7; one end only of the truss being hereshown. The diagonal brace bars 5 are of simple fiat bar stock and aredisposed from end to end of the truss.

The upper ends of the bars 5 and the top margins of the plates 6 areembraced by and riveted to down-turned Webs 8-8 of longitudinal, innerarch springer bars 9-9 of angle-iron whose ends reach down to and areriveted at 8 to the end plate 6. The extremitiesof the L-bars 9 areout-set as shown in Fig. 4 in detail to lap the webs 4: of the innerchord bars and are riveted at 11 thereon. The Webs 8 are cut away at 12so that the flange of the bar 9 can be bent back at a desired angle toform a toe reaching upward and cut and bent at an angle to provide ahorn 14.

Where the bars 9 are out-set from the chord members, fillers or spacers15 are introduced next to the plates 6 and receive rivets 16.

Suitably spaced out from the, inner, springer arch members 9-9 is anouter or upper component including down-turned L- bars 20-20 whose webs21 are spaced by and riveted on the top margin of the end plate 13. Theout'turned flanges to the top bars 20 rest on and are riveted to thehorns 14 of the plates 18 of the inner arch bars 9-9.

"It will be seen that the chord 44 is riveted to the bottom of the plate7 at 21 and that the upper arch parts 20-20 are riveted at 22. The Websof the plates 13 are riveted at 23 to the plate 7 At suitable pitchalong the arch springer a series of lattice bars 24: is riveted betweenthe webs of the upper and lower arch components 9 and 20.

' The flanges of the upper and lower bars 9 and 20 are connected bypairs of heavy bolts 25.

The above sets forth the detail construction ofa fabricatedtruss havinga straight bottomchord of angle bars 2-3 and a top structure ofv upperand lower springer or arch components 9-9 and 20-20. The webs 21 and 8are down-turned, and the chord webs are upturned.

The ends of the truss are adapted to set on any desired Wall body WV.

hen so set longitudinal roof joists J are hung from truss to truss andmounted, as shown in Fig. 6, between the out-turned flanges of the upperand the lower bars 9 and 20. The near ends j of the joists are 'wellspaced and preferably diverged from to form chambers which are filledwith concrete C; the lower ends of the fill resting on cross plates 30secured to the rests or plates 13.

Reinforcing rods 31 are planted, in the molds, to be embedded in thecast concrete beam.

I have, therefore, provided a truss wherein the roof joists are hungwith their top and bottom edges wholly between the upper and lowerflanges or inner and outer arch lines I of the arch component.

This is an important feature for it enables a material reduction on thecost of solid wall body which has to be carried up a distance, fixed byfire regulations, above the top line .of the end of the truss on thecarrying wall.

By placing the depth of the joists between the arch lines, or within thedepth of the top component I save fire wall height equal to the depth ofthe joists. If the joists laid above the top line of the arch additionalfire wall equal to the depth of the joists would be required. Fig. 7 isa diagram showing the inner pair of arch angle-bars being out-set to Voverlap and being riveted to. the webs of the chordangle-bars and havingupturned plate ends securedtov the websof the outerarch angle-bars. V v

2. A building truss including a pair of angle-bars forming a chord andhaving spaced, upturned Webs, an arch component including a top pair ofangle-barswith spaced, down-turned webs and an inner pair of angle-barswith spaced, down-turned webs, diagonal braces embraced by and rivetedto the webs of the chord pair and to the inner arch pair, lattice barsembraced by and riveted to the webs of the inner and outer arch pairs, atie'plate embraced by and riveted to the chord pair and-to the innerarch pair, and an end tie plate embraced by and riveted to the ends ofthe said several pairs, the

flanges of the arch pairs being out turned and pairs of bolts connectingthe pairs of vertically spaced flanges.

3. In a roof truss, an arch component including vertically spaced innerand outer pairs of angle-bars, a pair of chord anglebars, an end tieplate to which all of the pairs converge and are riveted, and an innerplate riveted to the inner arch pair and to the chord pair; said innerarch pair having the terminals of its bars upwardly bent to form plateswhich are secured to the outer arch pair.

4. A composite roof truss including a chord component, an arch componenthaving verti cally spaced members secured to the chord, a concrete beamcast within thespaced members, a cross plate between the arch membersand near their ends and forming a footing for the concrete beam.

5. A roof truss construction including a chordcomponent, an archcomponent having spaced pairs of structural members connected to thechord, roof joists having spaced ends hung on the inner of said members,and a concrete fill extending along the truss components and between thespaced ends of the joists.

6. A composite roof truss including a chord component, an arch componenthaving vertically spaced top and bottom 1nembers,sccuring-means betweenthe chord and said members and including upstanding bolts connectingsaid spaced members, a concrete archbeam cast within the spaced membersand embedding said bolts, a cross plate between the arch members attheir remote ends and forming the end footing of the arch-beam.

ALBIN E. SHODIN.

